Probing Lorentz-violating effects via precession and accretion disk images in a rotating bumblebee spacetime

Abstract

We investigate kinematic and optical signatures of Lorentz violation in the strong-field region of a rotating bumblebee spacetime generated by a scalar-gradient bumblebee field. For generic nonextremal rotating configurations with $al\ne 0$, the surface $r=r_{+}$ is curvature singular and is therefore modeled phenomenologically as a perfectly absorbing inner boundary in the ray-tracing calculation. By analyzing the spin precession of test gyroscopes and equatorial timelike geodesics, we find that Lorentz violation suppresses the Lense--Thirring precession of static observers, enhances geodetic precession in the static, spherically symmetric limit, and increases the periastron-precession frequency of bound circular orbits. Images of a geometrically thin accretion disk further show that the Lorentz violation has a negligible impact on the critical curve, while shrinking the inner-shadow-like feature associated with the absorbing boundary and enhancing the lensed ring. These results suggest that selected precession observables and exterior imaging features may provide complementary diagnostics of Lorentz-violating effects in strong-field gravity, whereas the central dark feature remains dependent on the adopted inner-boundary prescription.

Revised version after journal publication, with clarifications concerning the geometrical interpretation of the spacetime and the inner-boundary prescription. The main results and conclusions remain unchanged. Published in JCAP 08 (2026) 080

References in corpus (43)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
• Horizon-scale tests of gravity theories and fundamental physics from the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Black Hole Shadows, Photon Rings, and Lensing Rings
• Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
• Observing the Inner Shadow of a Black Hole: A Direct View of the Event Horizon
• Black holes with a cosmological constant in bumblebee gravity
• Image of Kerr-Melvin black hole with thin accretion disk
• QED Effect on Black Hole Shadow
• Strong gravitational lensing and shadow constraint from M87* of slowly rotating Kerr-like black hole
• Constraining a modified gravity theory in strong gravitational lensing and black hole shadow observations
• QNMs of slowly rotating Einstein-Bumblebee Black Hole
• Static spherical vacuum solutions in the bumblebee gravity model
• The Black Hole Explorer: Motivation and Vision
• Vacuum solution within a metric-affine bumblebee gravity
• Extended thermodynamics of the bumblebee black holes
• An exact stationary axisymmetric vacuum solution within a metric--affine bumblebee gravity
• Constraint on parameters of a rotating black hole in Einstein-bumblebee theory by quasi-periodic oscillations
• Orbital and epicyclic frequencies around rapidly rotating compact stars in scalar-tensor theories of gravity
• Anomalies in Particle Physics
• Charged spherically symmetric and slowly rotating charged black hole solutions in bumblebee gravity
• Prediction for the interferometric shape of the first black hole photon ring
• How does non-metricity affect particle creation and evaporation in bumblebee gravity?
• Harvesting correlations from BTZ black hole coupled to a Lorentz-violating vector field
• Quasinormal modes of a scalar perturbation around a rotating BTZ-like black hole in Einstein-bumblebee gravity
• Multi-level images around Kerr-Newman black holes
• Testing EGB gravity coupled to bumblebee field and black hole parameter estimation with EHT observations
• Modified particle dynamics and thermodynamics in a traversable wormhole in bumblebee gravity
• Timelike bound orbits and pericenter precession around black hole with conformally coupled scalar hair
• Lorentz violation induces isospectrality breaking in Einstein-Bumblebee gravity theory
• Precession and Lense-Thirring effect of hairy Kerr spacetimes
• Exact modifications on a vacuum spacetime due to a gradient bumblebee field at its vacuum expectation value
• Dynamic instability analysis for bumblebee black holes: the odd parity
• Testing black holes with cosmological constant in Einstein-bumblebee gravity through the black hole shadow using EHT data and deflection angle
• Kerr-scalaron metric and astronomical consequences near the Galactic Center black hole
• Static Spherical Vacuum Solution to Bumblebee Gravity with Time-like VEVs
• Full Classification of Static Spherical Vacuum Solutions to Bumblebee Gravity with General VEVs
• Exact Black Hole Solutions in Bumblebee Gravity with Lightlike or Spacelike VEVS
• Probing a Lorentz-violating parameter from orbital precession of the S2 star around the galactic centre supermassive black hole
• Boson Stars in Bumblebee Gravity and Their Gravitational Waveforms from Extreme-Mass-Ratio Inspirals
• Periodic orbits and gravitational waveforms of black holes in bumblebee gravity
• Gravitational aspects of a new bumblebee black hole